Conor McGregor was born on July 14, 1988, in Dublin, Ireland, and started boxing at the age of 12 to defend himself against bullies.
Before pursuing a career in MMA, McGregor was an apprentice plumber, but he quit his job to focus on fighting full-time.
McGregor made his professional MMA debut in 2008 and quickly gained a reputation for his striking power and confidence.
He became the first fighter in UFC history to hold titles in two weight divisions simultaneously, winning the Featherweight and Lightweight championships.
McGregor's knockout victory over Jose Aldo in just 13 seconds at UFC 194 is the fastest title fight finish in UFC history.
Known for his trash-talking and psychological warfare, McGregor often uses mind games to gain an advantage over his opponents before they even step into the octagon.
He made his professional boxing debut against Floyd Mayweather in 2017, in one of the most lucrative fights in combat sports history, although he lost by TKO in the 10th round.
McGregor's catchphrase, 'We're not here to take part, we're here to take over,' has become iconic among his fans.
Despite his brash persona, McGregor is known for his generosity, having donated large sums to hospitals, children's charities, and other causes in Ireland.
McGregor launched his own whiskey brand, Proper No. Twelve, in 2018, which quickly became a commercial success worldwide.
He became the first MMA fighter to make Forbes' list of the world's highest-paid athletes, ranking No. 1 in 2021, largely due to his earnings from the Mayweather fight and business ventures.
McGregor has headlined five of the six highest-selling pay-per-view events in UFC history, underscoring his drawing power as a fighter.
He has been involved in several controversies outside the octagon, including legal issues and altercations, which have often made headlines.
McGregor has expressed interest in returning to boxing, potentially setting up a rematch with Floyd Mayweather or other boxing stars.
Despite the ups and downs of his career, McGregor remains one of the most influential figures in MMA, continuing to inspire and polarize fans around the world.